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Partner Product

Model 6231  (Pentek Inc)
The Model 6231 is a general-purpose 16-channel narrowband digital receiver VIM-2 module. It attaches directly to VIM-compatible processor boards and connects directly to two processors.

Product Highlights

*Two 65 or 80 MHz, 14-bit A/D converters *Optional front panel FPGA I/O connector *All downconverters can select any of the two inputs *90 MHz input bandwidth *3.2 kHz to 1.6 MHz output bandwidths for ƒs = 64 MHz *Front panel clock and sync bus synchronize multiple boards *See Model 7131 for PMC version

Product Description

Front End

Model 6231 accepts two analog RF inputs

at +4 dBm full scale into 50 ohms on front

panel SMA connectors. Amplifier bandwidth

of 90 MHz supports direct IF undersampling.

Each input is amplified and, optionally,

lowpass filtered to remove out-of-band signals

and prevent aliasing. The filters may be bypassed

for undersampling applications.

Optionally available, transformer-coupled

inputs reduce distortion for input signals

above 10 MHz and are recommended for IF

undersampling applications.

Each of the two inputs is then digitized by

a 14-bit A/D converter which is capable of

operating at sample rates up to 65 MHz

(Analog Devices AD6644) or, optionally,

80 MHz (AD6645). The A/D converter

clock can be driven from an internal 64 MHz

or 80 MHz crystal oscillator, or from an external

sample clock supplied through a front

panel SMA connector.

Digital Downconverters

The 6231 includes four Graychip GC4016

quad narrowband downconverter chips.

The maximum input sampling rate for the

GC4016 is 80 MHz. Each device includes

four independently tuned receiver channels

capable of center frequency tuning from DC

to 32 MHz, and with output bandwidths

ranging from 3.2 kHz to 1.6 MHz (for 64 MHz

sample clock).

Each GC4016 accepts four 14-bit parallel

inputs from the two A/D converters. Internal crossbar switches allow all 16 channels

on the board to select either of the A/D inputs

for flexible switching.


The front panel clock and sync bus allow

one 6231 to act as a master, driving the

sample clock out to a front panel cable bus

using LVDS differential signaling. Multiple

slaves can then be clocked synchronously

with the master. Additional sync lines allow

synchronization of the local oscillator phase,

frequency switching, decimating filter phase,

and FIFO data collection on multiple 6231’s.

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Wind River, a wholly owned subsidiary of Intel Corporation (NASDAQ: INTC), is a world leader in embedded and mobile software. Wind River has been pioneering computing inside embedded devices since 1981 and its technology is found in more than 500 million products